将来护士会被机器人取代吗?(replace)
昨天他发生了什么事?What________ ________him yesterday?
当约翰步行去学校时,他在一棵树上看见一只猫。When John________ ________to school,he saw a cat________a tree.
但是之后,风力会逐渐减弱。But the wind will________ ________later on.
他们那时正在购物。They________ ________at that time.
天下雨时,你在干什么呢?What________you________while it________ ________?